Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1 | /* Copyright 1996-2006,2008,2009 Alain Knaff. |
| 2 | * This file is part of mtools. |
| 3 | * |
| 4 | * Mtools is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * Mtools is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with Mtools. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 18 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 19 | #include "sysincludes.h" |
| 20 | #include "msdos.h" |
| 21 | #include "stream.h" |
| 22 | #include "mtools.h" |
| 23 | #include "fsP.h" |
| 24 | #include "file_name.h" |
| 25 | |
| 26 | #ifdef HAVE_LONG_LONG |
| 27 | typedef long long fatBitMask; |
| 28 | #else |
| 29 | typedef long fatBitMask; |
| 30 | #endif |
| 31 | |
| 32 | typedef struct FatMap_t { |
| 33 | unsigned char *data; |
| 34 | fatBitMask dirty; |
| 35 | fatBitMask valid; |
| 36 | } FatMap_t; |
| 37 | |
| 38 | #define SECT_PER_ENTRY (sizeof(fatBitMask)*8) |
| 39 | #define ONE ((fatBitMask) 1) |
| 40 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 41 | static __inline__ ssize_t readSector(Fs_t *This, char *buf, unsigned int off, |
| 42 | size_t size) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 43 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 44 | return PREADS(This->head.Next, buf, sectorsToBytes(This, off), |
| 45 | size << This->sectorShift); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 46 | } |
| 47 | |
| 48 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 49 | static __inline__ ssize_t forceReadSector(Fs_t *This, char *buf, |
| 50 | unsigned int off, size_t size) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 51 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 52 | return force_pread(This->head.Next, buf, sectorsToBytes(This, off), |
| 53 | size << This->sectorShift); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 57 | static __inline__ ssize_t forceWriteSector(Fs_t *This, char *buf, unsigned int off, |
| 58 | size_t size) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 59 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 60 | return force_pwrite(This->head.Next, buf, sectorsToBytes(This, off), |
| 61 | size << This->sectorShift); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | |
| 65 | static FatMap_t *GetFatMap(Fs_t *Stream) |
| 66 | { |
| 67 | size_t nr_entries; |
| 68 | size_t i; |
| 69 | FatMap_t *map; |
| 70 | |
| 71 | Stream->fat_error = 0; |
| 72 | nr_entries = (Stream->fat_len + SECT_PER_ENTRY - 1) / SECT_PER_ENTRY; |
| 73 | map = NewArray(nr_entries, FatMap_t); |
| 74 | if(!map) |
| 75 | return 0; |
| 76 | |
| 77 | for(i=0; i< nr_entries; i++) { |
| 78 | map[i].data = 0; |
| 79 | map[i].valid = 0; |
| 80 | map[i].dirty = 0; |
| 81 | } |
| 82 | |
| 83 | return map; |
| 84 | } |
| 85 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 86 | static __inline__ int locate(Fs_t *Stream, uint32_t offset, |
| 87 | uint32_t *slot, uint32_t *bit) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 88 | { |
| 89 | if(offset >= Stream->fat_len) |
| 90 | return -1; |
| 91 | *slot = offset / SECT_PER_ENTRY; |
| 92 | *bit = offset % SECT_PER_ENTRY; |
| 93 | return 0; |
| 94 | } |
| 95 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 96 | static __inline__ ssize_t fatReadSector(Fs_t *This, |
| 97 | unsigned int sector, |
| 98 | unsigned int slot, |
| 99 | unsigned int bit, unsigned int dupe, |
| 100 | fatBitMask bitmap) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 101 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 102 | unsigned int fat_start; |
| 103 | ssize_t ret; |
| 104 | unsigned int nr_sectors; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 105 | |
| 106 | dupe = (dupe + This->primaryFat) % This->num_fat; |
| 107 | fat_start = This->fat_start + This->fat_len * dupe; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 108 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 109 | if(bitmap == 0) { |
| 110 | nr_sectors = SECT_PER_ENTRY - bit%SECT_PER_ENTRY; |
| 111 | } else { |
| 112 | nr_sectors = 1; |
| 113 | } |
| 114 | |
| 115 | /* first, read as much as the buffer can give us */ |
| 116 | ret = readSector(This, |
| 117 | (char *)(This->FatMap[slot].data+(bit<<This->sectorShift)), |
| 118 | fat_start+sector, |
| 119 | nr_sectors); |
| 120 | if(ret < 0) |
| 121 | return 0; |
| 122 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 123 | if((size_t) ret < This->sector_size) { |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 124 | /* if we got less than one sector's worth, insist to get at |
| 125 | * least one sector */ |
| 126 | ret = forceReadSector(This, |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 127 | (char *) (This->FatMap[slot].data + |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 128 | (bit << This->sectorShift)), |
| 129 | fat_start+sector, 1); |
| 130 | if(ret < (int) This->sector_size) |
| 131 | return 0; |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | return ret >> This->sectorShift; |
| 136 | } |
| 137 | |
| 138 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 139 | static ssize_t fatWriteSector(Fs_t *This, |
| 140 | unsigned int sector, |
| 141 | unsigned int slot, |
| 142 | unsigned int bit, |
| 143 | unsigned int dupe) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 144 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 145 | unsigned int fat_start; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 146 | |
| 147 | dupe = (dupe + This->primaryFat) % This->num_fat; |
| 148 | if(dupe && !This->writeAllFats) |
| 149 | return This->sector_size; |
| 150 | |
| 151 | fat_start = This->fat_start + This->fat_len * dupe; |
| 152 | |
| 153 | return forceWriteSector(This, |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 154 | (char *) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 155 | (This->FatMap[slot].data + bit * This->sector_size), |
| 156 | fat_start+sector, 1); |
| 157 | } |
| 158 | |
| 159 | static unsigned char *loadSector(Fs_t *This, |
| 160 | unsigned int sector, fatAccessMode_t mode, |
| 161 | int recurs) |
| 162 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 163 | uint32_t slot, bit; |
| 164 | ssize_t ret; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 165 | |
| 166 | if(locate(This,sector, &slot, &bit) < 0) |
| 167 | return 0; |
| 168 | #if 0 |
| 169 | if (((This->fat_len + SECT_PER_ENTRY - 1) / SECT_PER_ENTRY) <= slot) { |
| 170 | fprintf(stderr,"This should not happen\n"); |
| 171 | fprintf(stderr, "fat_len = %d\n", This->fat_len); |
| 172 | fprintf(stderr, "SECT_PER_ENTRY=%d\n", (int)SECT_PER_ENTRY); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 173 | fprintf(stderr, "sector = %d slot = %d bit=%d\n", |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 174 | sector, slot, bit); |
| 175 | fprintf(stderr, "left = %d",(int) |
| 176 | ((This->fat_len+SECT_PER_ENTRY-1) / SECT_PER_ENTRY)); |
| 177 | return 0; |
| 178 | } |
| 179 | #endif |
| 180 | if(!This->FatMap[slot].data) { |
| 181 | /* allocate the storage space */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 182 | This->FatMap[slot].data = |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 183 | malloc(This->sector_size * SECT_PER_ENTRY); |
| 184 | if(!This->FatMap[slot].data) |
| 185 | return 0; |
| 186 | memset(This->FatMap[slot].data, 0xee, |
| 187 | This->sector_size * SECT_PER_ENTRY); |
| 188 | } |
| 189 | |
| 190 | if(! (This->FatMap[slot].valid & (ONE << bit))) { |
| 191 | unsigned int i; |
| 192 | ret = -1; |
| 193 | for(i=0; i< This->num_fat; i++) { |
| 194 | /* read the sector */ |
| 195 | ret = fatReadSector(This, sector, slot, bit, i, |
| 196 | This->FatMap[slot].valid); |
| 197 | |
| 198 | if(ret == 0) { |
| 199 | fprintf(stderr, |
| 200 | "Error reading fat number %d\n", i); |
| 201 | continue; |
| 202 | } |
| 203 | if(This->FatMap[slot].valid) |
| 204 | /* Set recurs if there have already been |
| 205 | * sectors loaded in this bitmap long |
| 206 | */ |
| 207 | recurs = 1; |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | /* all copies bad. Return error */ |
| 212 | if(ret == 0) |
| 213 | return 0; |
| 214 | |
| 215 | for(i=0; (int) i < ret; i++) |
| 216 | This->FatMap[slot].valid |= ONE << (bit + i); |
| 217 | |
| 218 | if(!recurs && ret == 1) |
| 219 | /* do some prefetching, if we happened to only |
| 220 | * get one sector */ |
| 221 | loadSector(This, sector+1, mode, 1); |
| 222 | if(!recurs && batchmode) |
| 223 | for(i=0; i < 1024; i++) |
| 224 | loadSector(This, sector+i, mode, 1); |
| 225 | } |
| 226 | |
| 227 | if(mode == FAT_ACCESS_WRITE) { |
| 228 | This->FatMap[slot].dirty |= ONE << bit; |
| 229 | This->fat_dirty = 1; |
| 230 | } |
| 231 | return This->FatMap[slot].data + (bit << This->sectorShift); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | static unsigned char *getAddress(Fs_t *Stream, |
| 236 | unsigned int num, fatAccessMode_t mode) |
| 237 | { |
| 238 | unsigned char *ret; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 239 | unsigned int sector; |
| 240 | unsigned int offset; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 241 | |
| 242 | sector = num >> Stream->sectorShift; |
| 243 | ret = 0; |
| 244 | if(sector == Stream->lastFatSectorNr && |
| 245 | Stream->lastFatAccessMode >= mode) |
| 246 | ret = Stream->lastFatSectorData; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 247 | if(!ret) { |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 248 | ret = loadSector(Stream, sector, mode, 0); |
| 249 | if(!ret) |
| 250 | return 0; |
| 251 | Stream->lastFatSectorNr = sector; |
| 252 | Stream->lastFatSectorData = ret; |
| 253 | Stream->lastFatAccessMode = mode; |
| 254 | } |
| 255 | offset = num & Stream->sectorMask; |
| 256 | return ret+offset; |
| 257 | } |
| 258 | |
| 259 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 260 | static int readByte(Fs_t *Stream, unsigned int start) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 261 | { |
| 262 | unsigned char *address; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 263 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 264 | address = getAddress(Stream, start, FAT_ACCESS_READ); |
| 265 | if(!address) |
| 266 | return -1; |
| 267 | return *address; |
| 268 | } |
| 269 | |
| 270 | |
| 271 | /* |
| 272 | * Fat 12 encoding: |
| 273 | * | byte n | byte n+1 | byte n+2 | |
| 274 | * |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0| |
| 275 | * | | | | | | | | | | | | | | | | | | | | | | | | | |
| 276 | * | n+0.0 | n+0.5 | n+1.0 | n+1.5 | n+2.0 | n+2.5 | |
| 277 | * \_____ \____ \______/________/_____ / |
| 278 | * ____\______\________/ _____/ ____\_/ |
| 279 | * / \ \ / / \ |
| 280 | * | n+1.5 | n+0.0 | n+0.5 | n+2.0 | n+2.5 | n+1.0 | |
| 281 | * | FAT entry k | FAT entry k+1 | |
| 282 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 283 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 284 | /* |
| 285 | * Get and decode a FAT (file allocation table) entry. Returns the cluster |
| 286 | * number on success or 1 on failure. |
| 287 | */ |
| 288 | |
| 289 | static unsigned int fat12_decode(Fs_t *Stream, unsigned int num) |
| 290 | { |
| 291 | unsigned int start = num * 3 / 2; |
| 292 | int byte0 = readByte(Stream, start); |
| 293 | int byte1 = readByte(Stream, start+1); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 294 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 295 | if (num < 2 || byte0 < 0 || byte1 < 0 || num > Stream->num_clus+1) { |
| 296 | fprintf(stderr,"[1] Bad address %d\n", num); |
| 297 | return 1; |
| 298 | } |
| 299 | |
| 300 | if (num & 1) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 301 | return ((uint32_t)byte1 << 4) | (((uint32_t)byte0 & 0xf0)>>4); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 302 | else |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 303 | return (((uint32_t)byte1 & 0xf) << 8) | (uint32_t)byte0; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | |
| 307 | /* |
| 308 | * Puts a code into the FAT table. Is the opposite of fat_decode(). No |
| 309 | * sanity checking is done on the code. Returns a 1 on error. |
| 310 | */ |
| 311 | static void fat12_encode(Fs_t *Stream, unsigned int num, unsigned int code) |
| 312 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 313 | unsigned int start = num * 3 / 2; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 314 | unsigned char *address0 = getAddress(Stream, start, FAT_ACCESS_WRITE); |
| 315 | unsigned char *address1 = getAddress(Stream, start+1, FAT_ACCESS_WRITE); |
| 316 | |
| 317 | if (num & 1) { |
| 318 | /* (odd) not on byte boundary */ |
| 319 | *address0 = (*address0 & 0x0f) | ((code << 4) & 0xf0); |
| 320 | *address1 = (code >> 4) & 0xff; |
| 321 | } else { |
| 322 | /* (even) on byte boundary */ |
| 323 | *address0 = code & 0xff; |
| 324 | *address1 = (*address1 & 0xf0) | ((code >> 8) & 0x0f); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | |
| 329 | /* |
| 330 | * Fat 16 encoding: |
| 331 | * | byte n | byte n+1 | |
| 332 | * |7|6|5|4|3|2|1|0|7|6|5|4|3|2|1|0| |
| 333 | * | | | | | | | | | | | | | | | | | |
| 334 | * | FAT entry k | |
| 335 | */ |
| 336 | |
| 337 | static unsigned int fat16_decode(Fs_t *Stream, unsigned int num) |
| 338 | { |
| 339 | unsigned char *address = getAddress(Stream, num << 1, FAT_ACCESS_READ); |
| 340 | if(!address) |
| 341 | return 1; |
| 342 | return _WORD(address); |
| 343 | } |
| 344 | |
| 345 | static void fat16_encode(Fs_t *Stream, unsigned int num, unsigned int code) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 346 | { |
| 347 | if(code > UINT16_MAX) { |
| 348 | fprintf(stderr, "FAT16 code %x too big\n", code); |
| 349 | exit(1); |
| 350 | } |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 351 | unsigned char *address = getAddress(Stream, num << 1, FAT_ACCESS_WRITE); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 352 | set_word(address, (uint16_t) code); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 353 | } |
| 354 | |
| 355 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 356 | #pragma GCC diagnostic push |
| 357 | #pragma GCC diagnostic ignored "-Wcast-align" |
| 358 | /* Ignore alignment warnings about casting to type with higher |
| 359 | * alignment requirement. Requirement is met, as initial pointer is an |
| 360 | * even offset into a buffer allocated by malloc, which according to |
| 361 | * manpage is "suitably aligned for any built-in type */ |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 362 | static unsigned int fast_fat16_decode(Fs_t *Stream, unsigned int num) |
| 363 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 364 | unsigned short *address = |
| 365 | (unsigned short *) getAddress(Stream, num << 1, |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 366 | FAT_ACCESS_READ); |
| 367 | if(!address) |
| 368 | return 1; |
| 369 | return *address; |
| 370 | } |
| 371 | |
| 372 | static void fast_fat16_encode(Fs_t *Stream, unsigned int num, unsigned int code) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 373 | { |
| 374 | unsigned short *address = |
| 375 | (unsigned short *) getAddress(Stream, num << 1, |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 376 | FAT_ACCESS_WRITE); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 377 | if(code > UINT16_MAX) { |
| 378 | fprintf(stderr, "FAT16 code %x too big\n", code); |
| 379 | exit(1); |
| 380 | } |
| 381 | *address = (uint16_t) code; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 382 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 383 | #pragma GCC diagnostic pop |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 384 | |
| 385 | |
| 386 | |
| 387 | /* |
| 388 | * Fat 32 encoding |
| 389 | */ |
| 390 | #define FAT32_HIGH 0xf0000000 |
| 391 | #define FAT32_ADDR 0x0fffffff |
| 392 | |
| 393 | static unsigned int fat32_decode(Fs_t *Stream, unsigned int num) |
| 394 | { |
| 395 | unsigned char *address = getAddress(Stream, num << 2, FAT_ACCESS_READ); |
| 396 | if(!address) |
| 397 | return 1; |
| 398 | return _DWORD(address) & FAT32_ADDR; |
| 399 | } |
| 400 | |
| 401 | static void fat32_encode(Fs_t *Stream, unsigned int num, unsigned int code) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 402 | { |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 403 | unsigned char *address = getAddress(Stream, num << 2, FAT_ACCESS_WRITE); |
| 404 | set_dword(address,(code&FAT32_ADDR) | (_DWORD(address)&FAT32_HIGH)); |
| 405 | } |
| 406 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 407 | #pragma GCC diagnostic push |
| 408 | #pragma GCC diagnostic ignored "-Wcast-align" |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 409 | static unsigned int fast_fat32_decode(Fs_t *Stream, unsigned int num) |
| 410 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 411 | unsigned int *address = |
| 412 | (unsigned int *) getAddress(Stream, num << 2, |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 413 | FAT_ACCESS_READ); |
| 414 | if(!address) |
| 415 | return 1; |
| 416 | return (*address) & FAT32_ADDR; |
| 417 | } |
| 418 | |
| 419 | static void fast_fat32_encode(Fs_t *Stream, unsigned int num, unsigned int code) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 420 | { |
| 421 | unsigned int *address = |
| 422 | (unsigned int *) getAddress(Stream, num << 2, |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 423 | FAT_ACCESS_WRITE); |
| 424 | *address = (*address & FAT32_HIGH) | (code & FAT32_ADDR); |
| 425 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 426 | #pragma GCC diagnostic pop |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 427 | |
| 428 | /* |
| 429 | * Write the FAT table to the disk. Up to now the FAT manipulation has |
| 430 | * been done in memory. All errors are fatal. (Might not be too smart |
| 431 | * to wait till the end of the program to write the table. Oh well...) |
| 432 | */ |
| 433 | |
| 434 | void fat_write(Fs_t *This) |
| 435 | { |
| 436 | unsigned int i, j, dups, bit, slot; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 437 | ssize_t ret; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 438 | |
| 439 | /*fprintf(stderr, "Fat write\n");*/ |
| 440 | |
| 441 | if (!This->fat_dirty) |
| 442 | return; |
| 443 | |
| 444 | dups = This->num_fat; |
| 445 | if (This->fat_error) |
| 446 | dups = 1; |
| 447 | |
| 448 | |
| 449 | for(i=0; i<dups; i++){ |
| 450 | j = 0; |
| 451 | for(slot=0;j<This->fat_len;slot++) { |
| 452 | if(!This->FatMap[slot].dirty) { |
| 453 | j += SECT_PER_ENTRY; |
| 454 | continue; |
| 455 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 456 | for(bit=0; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 457 | bit < SECT_PER_ENTRY && j<This->fat_len; |
| 458 | bit++,j++) { |
| 459 | if(!(This->FatMap[slot].dirty & (ONE << bit))) |
| 460 | continue; |
| 461 | ret = fatWriteSector(This,j,slot, bit, i); |
| 462 | if (ret < (int) This->sector_size){ |
| 463 | if (ret < 0 ){ |
| 464 | perror("error in fat_write"); |
| 465 | exit(1); |
| 466 | } else { |
| 467 | fprintf(stderr, |
| 468 | "end of file in fat_write\n"); |
| 469 | exit(1); |
| 470 | } |
| 471 | } |
| 472 | /* if last dupe, zero it out */ |
| 473 | if(i==dups-1) |
| 474 | This->FatMap[slot].dirty &= ~(ONE<<bit); |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | /* write the info sector, if any */ |
| 479 | if(This->infoSectorLoc && This->infoSectorLoc != MAX32) { |
| 480 | /* initialize info sector */ |
| 481 | InfoSector_t *infoSector; |
| 482 | infoSector = (InfoSector_t *) safe_malloc(This->sector_size); |
| 483 | if(forceReadSector(This, (char *)infoSector, |
| 484 | This->infoSectorLoc, 1) != |
| 485 | (signed int) This->sector_size) { |
| 486 | fprintf(stderr,"Trouble reading the info sector\n"); |
| 487 | memset(infoSector->filler1, 0, sizeof(infoSector->filler1)); |
| 488 | memset(infoSector->filler2, 0, sizeof(infoSector->filler2)); |
| 489 | } |
| 490 | set_dword(infoSector->signature1, INFOSECT_SIGNATURE1); |
| 491 | set_dword(infoSector->signature2, INFOSECT_SIGNATURE2); |
| 492 | set_dword(infoSector->pos, This->last); |
| 493 | set_dword(infoSector->count, This->freeSpace); |
| 494 | set_word(infoSector->signature3, 0xaa55); |
| 495 | if(forceWriteSector(This, (char *)infoSector, This->infoSectorLoc, 1) != |
| 496 | (signed int) This->sector_size) |
| 497 | fprintf(stderr,"Trouble writing the info sector\n"); |
| 498 | free(infoSector); |
| 499 | } |
| 500 | This->fat_dirty = 0; |
| 501 | This->lastFatAccessMode = FAT_ACCESS_READ; |
| 502 | } |
| 503 | |
| 504 | |
| 505 | |
| 506 | /* |
| 507 | * Zero-Fat |
| 508 | * Used by mformat. |
| 509 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 510 | int zero_fat(Fs_t *Stream, uint8_t media_descriptor) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 511 | { |
| 512 | unsigned int i, j; |
| 513 | unsigned int fat_start; |
| 514 | unsigned char *buf; |
| 515 | |
| 516 | buf = malloc(Stream->sector_size); |
| 517 | if(!buf) { |
| 518 | perror("alloc fat sector buffer"); |
| 519 | return -1; |
| 520 | } |
| 521 | for(i=0; i< Stream->num_fat; i++) { |
| 522 | fat_start = Stream->fat_start + i*Stream->fat_len; |
| 523 | for(j = 0; j < Stream->fat_len; j++) { |
| 524 | if(j <= 1) |
| 525 | memset(buf, 0, Stream->sector_size); |
| 526 | if(!j) { |
| 527 | buf[0] = media_descriptor; |
| 528 | buf[2] = buf[1] = 0xff; |
| 529 | if(Stream->fat_bits > 12) |
| 530 | buf[3] = 0xff; |
| 531 | if(Stream->fat_bits > 16) { |
| 532 | buf[4] = 0xff; |
| 533 | buf[5] = 0xff; |
| 534 | buf[6] = 0xff; |
| 535 | buf[7] = 0x0f; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | if(forceWriteSector(Stream, (char *)buf, |
| 540 | fat_start + j, 1) != |
| 541 | (signed int) Stream->sector_size) { |
| 542 | fprintf(stderr, |
| 543 | "Trouble initializing a FAT sector\n"); |
| 544 | free(buf); |
| 545 | return -1; |
| 546 | } |
| 547 | } |
| 548 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 549 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 550 | free(buf); |
| 551 | Stream->FatMap = GetFatMap(Stream); |
| 552 | if (Stream->FatMap == NULL) { |
| 553 | perror("alloc fat map"); |
| 554 | return -1; |
| 555 | } |
| 556 | return 0; |
| 557 | } |
| 558 | |
| 559 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 560 | static void set_fat12(Fs_t *This) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 561 | { |
| 562 | This->fat_bits = 12; |
| 563 | This->end_fat = 0xfff; |
| 564 | This->last_fat = 0xff6; |
| 565 | This->fat_decode = fat12_decode; |
| 566 | This->fat_encode = fat12_encode; |
| 567 | } |
| 568 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 569 | static uint16_t word_endian_test = 0x1234; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 570 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 571 | static void set_fat16(Fs_t *This) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 572 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 573 | uint8_t *t = (uint8_t *) &word_endian_test; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 574 | This->fat_bits = 16; |
| 575 | This->end_fat = 0xffff; |
| 576 | This->last_fat = 0xfff6; |
| 577 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 578 | if(t[0] == 0x34 && t[1] == 0x12) { |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 579 | This->fat_decode = fast_fat16_decode; |
| 580 | This->fat_encode = fast_fat16_encode; |
| 581 | } else { |
| 582 | This->fat_decode = fat16_decode; |
| 583 | This->fat_encode = fat16_encode; |
| 584 | } |
| 585 | } |
| 586 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 587 | static uint32_t dword_endian_test = 0x12345678; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 588 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 589 | static void set_fat32(Fs_t *This) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 590 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 591 | uint8_t *t = (uint8_t *) &dword_endian_test; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 592 | This->fat_bits = 32; |
| 593 | This->end_fat = 0xfffffff; |
| 594 | This->last_fat = 0xffffff6; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 595 | |
| 596 | if(t[0] == 0x78 && t[1] == 0x56 && t[2] == 0x34 && t[3] == 0x12) { |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 597 | This->fat_decode = fast_fat32_decode; |
| 598 | This->fat_encode = fast_fat32_encode; |
| 599 | } else { |
| 600 | This->fat_decode = fat32_decode; |
| 601 | This->fat_encode = fat32_encode; |
| 602 | } |
| 603 | } |
| 604 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 605 | void set_fat(Fs_t *This) { |
| 606 | if(This->num_clus < FAT12) |
| 607 | set_fat12(This); |
| 608 | else if(This->num_clus < FAT16) |
| 609 | set_fat16(This); |
| 610 | else |
| 611 | set_fat32(This); |
| 612 | } |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 613 | |
| 614 | static int check_fat(Fs_t *This) |
| 615 | { |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 616 | /* |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 617 | * This is only a sanity check. For disks with really big FATs, |
| 618 | * there is no point in checking the whole FAT. |
| 619 | */ |
| 620 | |
| 621 | unsigned int i, f; |
| 622 | unsigned int tocheck; |
| 623 | if(mtools_skip_check) |
| 624 | return 0; |
| 625 | |
| 626 | /* too few sectors in the FAT */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 627 | if(This->fat_len < NEEDED_FAT_SIZE(This)) { |
| 628 | fprintf(stderr, "Too few sectors in FAT\n"); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 629 | return -1; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 630 | } |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 631 | /* we do not warn about too much sectors in FAT, which may |
| 632 | * happen when a partition has been shrunk using FIPS, or on |
| 633 | * other occurrences */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 634 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 635 | tocheck = This->num_clus; |
| 636 | if (tocheck + 1 >= This->last_fat) { |
| 637 | fprintf(stderr, "Too many clusters in FAT\n"); |
| 638 | return -1; |
| 639 | } |
| 640 | |
| 641 | if(tocheck > 4096) |
| 642 | tocheck = 4096; |
| 643 | |
| 644 | for ( i= 3 ; i < tocheck; i++){ |
| 645 | f = This->fat_decode(This,i); |
| 646 | if (f == 1 || (f < This->last_fat && f > This->num_clus)){ |
| 647 | fprintf(stderr, |
| 648 | "Cluster # at %d too big(%#x)\n", i,f); |
| 649 | fprintf(stderr,"Probably non MS-DOS disk\n"); |
| 650 | return -1; |
| 651 | } |
| 652 | } |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | |
| 657 | /* |
| 658 | * Read the first sector of FAT table into memory. Crude error detection on |
| 659 | * wrong FAT encoding scheme. |
| 660 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 661 | static int check_media_type(Fs_t *This, union bootsector *boot) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 662 | { |
| 663 | unsigned char *address; |
| 664 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 665 | This->FatMap = GetFatMap(This); |
| 666 | if (This->FatMap == NULL) { |
| 667 | perror("alloc fat map"); |
| 668 | return -1; |
| 669 | } |
| 670 | |
| 671 | address = getAddress(This, 0, FAT_ACCESS_READ); |
| 672 | if(!address) { |
| 673 | fprintf(stderr, |
| 674 | "Could not read first FAT sector\n"); |
| 675 | return -1; |
| 676 | } |
| 677 | |
| 678 | if(mtools_skip_check) |
| 679 | return 0; |
| 680 | |
| 681 | if(!address[0] && !address[1] && !address[2]) |
| 682 | /* Some Atari disks have zeroes where Dos has media descriptor |
| 683 | * and 0xff. Do not consider this as an error */ |
| 684 | return 0; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 685 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 686 | if((address[0] != boot->boot.descr && boot->boot.descr >= 0xf0 && |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 687 | ((address[0] != 0xf9 && address[0] != 0xf7) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 688 | || boot->boot.descr != 0xf0)) || address[0] < 0xf0) { |
| 689 | fprintf(stderr, |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 690 | "Bad media types %02x/%02x, probably non-MSDOS disk\n", |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 691 | address[0], |
| 692 | boot->boot.descr); |
| 693 | return -1; |
| 694 | } |
| 695 | |
| 696 | if(address[1] != 0xff || address[2] != 0xff){ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 697 | fprintf(stderr,"Initial bytes of fat is not 0xff\n"); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 698 | return -1; |
| 699 | } |
| 700 | |
| 701 | return 0; |
| 702 | } |
| 703 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 704 | static int fat_32_read(Fs_t *This, union bootsector *boot) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 705 | { |
| 706 | size_t size; |
| 707 | |
| 708 | This->fat_len = DWORD(ext.fat32.bigFat); |
| 709 | This->writeAllFats = !(boot->boot.ext.fat32.extFlags[0] & 0x80); |
| 710 | This->primaryFat = boot->boot.ext.fat32.extFlags[0] & 0xf; |
| 711 | This->rootCluster = DWORD(ext.fat32.rootCluster); |
| 712 | This->clus_start = This->fat_start + This->num_fat * This->fat_len; |
| 713 | |
| 714 | /* read the info sector */ |
| 715 | size = This->sector_size; |
| 716 | This->infoSectorLoc = WORD(ext.fat32.infoSector); |
| 717 | if(This->sector_size >= 512 && |
| 718 | This->infoSectorLoc && This->infoSectorLoc != MAX32) { |
| 719 | InfoSector_t *infoSector; |
| 720 | infoSector = (InfoSector_t *) safe_malloc(size); |
| 721 | if(forceReadSector(This, (char *)infoSector, |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 722 | This->infoSectorLoc, 1) == |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 723 | (signed int) This->sector_size && |
| 724 | _DWORD(infoSector->signature1) == INFOSECT_SIGNATURE1 && |
| 725 | _DWORD(infoSector->signature2) == INFOSECT_SIGNATURE2) { |
| 726 | This->freeSpace = _DWORD(infoSector->count); |
| 727 | This->last = _DWORD(infoSector->pos); |
| 728 | } |
| 729 | free(infoSector); |
| 730 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 731 | |
| 732 | return(check_media_type(This, boot) || check_fat(This)); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 736 | static int old_fat_read(Fs_t *This, union bootsector *boot, int nodups) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 737 | { |
| 738 | This->writeAllFats = 1; |
| 739 | This->primaryFat = 0; |
| 740 | This->dir_start = This->fat_start + This->num_fat * This->fat_len; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 741 | This->infoSectorLoc = MAX32; |
| 742 | |
| 743 | if(nodups) |
| 744 | This->num_fat = 1; |
| 745 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 746 | if(check_media_type(This, boot)) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 747 | return -1; |
| 748 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 749 | if(This->num_clus >= FAT12) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 750 | /* third FAT byte must be 0xff */ |
| 751 | if(!mtools_skip_check && readByte(This, 3) != 0xff) |
| 752 | return -1; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 753 | |
| 754 | return check_fat(This); |
| 755 | } |
| 756 | |
| 757 | /* |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 758 | * Read the first sector of the FAT table into memory and initialize |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 759 | * structures. |
| 760 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 761 | int fat_read(Fs_t *This, union bootsector *boot, int nodups) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 762 | { |
| 763 | This->fat_error = 0; |
| 764 | This->fat_dirty = 0; |
| 765 | This->last = MAX32; |
| 766 | This->freeSpace = MAX32; |
| 767 | This->lastFatSectorNr = 0; |
| 768 | This->lastFatSectorData = 0; |
| 769 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 770 | if(This->num_clus < FAT16) |
| 771 | return old_fat_read(This, boot, nodups); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 772 | else |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 773 | return fat_32_read(This, boot); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 774 | } |
| 775 | |
| 776 | |
| 777 | unsigned int fatDecode(Fs_t *This, unsigned int pos) |
| 778 | { |
| 779 | unsigned int ret; |
| 780 | |
| 781 | ret = This->fat_decode(This, pos); |
| 782 | if(ret && (ret < 2 || ret > This->num_clus+1) && ret < This->last_fat) { |
| 783 | fprintf(stderr, "Bad FAT entry %d at %d\n", ret, pos); |
| 784 | This->fat_error++; |
| 785 | } |
| 786 | return ret; |
| 787 | } |
| 788 | |
| 789 | /* append a new cluster */ |
| 790 | void fatAppend(Fs_t *This, unsigned int pos, unsigned int newpos) |
| 791 | { |
| 792 | This->fat_encode(This, pos, newpos); |
| 793 | This->fat_encode(This, newpos, This->end_fat); |
| 794 | if(This->freeSpace != MAX32) |
| 795 | This->freeSpace--; |
| 796 | } |
| 797 | |
| 798 | /* de-allocates the given cluster */ |
| 799 | void fatDeallocate(Fs_t *This, unsigned int pos) |
| 800 | { |
| 801 | This->fat_encode(This, pos, 0); |
| 802 | if(This->freeSpace != MAX32) |
| 803 | This->freeSpace++; |
| 804 | } |
| 805 | |
| 806 | /* allocate a new cluster */ |
| 807 | void fatAllocate(Fs_t *This, unsigned int pos, unsigned int value) |
| 808 | { |
| 809 | This->fat_encode(This, pos, value); |
| 810 | if(This->freeSpace != MAX32) |
| 811 | This->freeSpace--; |
| 812 | } |
| 813 | |
| 814 | void fatEncode(Fs_t *This, unsigned int pos, unsigned int value) |
| 815 | { |
| 816 | unsigned int oldvalue = This->fat_decode(This, pos); |
| 817 | This->fat_encode(This, pos, value); |
| 818 | if(This->freeSpace != MAX32) { |
| 819 | if(oldvalue) |
| 820 | This->freeSpace++; |
| 821 | if(value) |
| 822 | This->freeSpace--; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | unsigned int get_next_free_cluster(Fs_t *This, unsigned int last) |
| 827 | { |
| 828 | unsigned int i; |
| 829 | |
| 830 | if(This->last != MAX32) |
| 831 | last = This->last; |
| 832 | |
| 833 | if (last < 2 || |
| 834 | last >= This->num_clus+1) |
| 835 | last = 1; |
| 836 | |
| 837 | for (i=last+1; i< This->num_clus+2; i++) { |
| 838 | unsigned int r = fatDecode(This, i); |
| 839 | if(r == 1) |
| 840 | goto exit_0; |
| 841 | if (!r) { |
| 842 | This->last = i; |
| 843 | return i; |
| 844 | } |
| 845 | } |
| 846 | |
| 847 | for(i=2; i < last+1; i++) { |
| 848 | unsigned int r = fatDecode(This, i); |
| 849 | if(r == 1) |
| 850 | goto exit_0; |
| 851 | if (!r) { |
| 852 | This->last = i; |
| 853 | return i; |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | |
| 858 | fprintf(stderr,"No free cluster %d %d\n", This->preallocatedClusters, |
| 859 | This->last); |
| 860 | return 1; |
| 861 | exit_0: |
| 862 | fprintf(stderr, "FAT error\n"); |
| 863 | return 1; |
| 864 | } |
| 865 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 866 | bool getSerialized(Fs_t *Fs) { |
| 867 | return Fs->serialized; |
| 868 | } |
| 869 | |
| 870 | unsigned long getSerialNumber(Fs_t *Fs) { |
| 871 | return Fs->serial_number; |
| 872 | } |
| 873 | |
| 874 | uint32_t getClusterBytes(Fs_t *Fs) { |
| 875 | return Fs->cluster_size * Fs->sector_size; |
| 876 | } |
| 877 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 878 | int fat_error(Stream_t *Dir) |
| 879 | { |
| 880 | Stream_t *Stream = GetFs(Dir); |
| 881 | DeclareThis(Fs_t); |
| 882 | |
| 883 | if(This->fat_error) |
| 884 | fprintf(stderr,"Fat error detected\n"); |
| 885 | |
| 886 | return This->fat_error; |
| 887 | } |
| 888 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 889 | uint32_t fat32RootCluster(Stream_t *Dir) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 890 | { |
| 891 | Stream_t *Stream = GetFs(Dir); |
| 892 | DeclareThis(Fs_t); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 893 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 894 | if(This->fat_bits == 32) |
| 895 | return This->rootCluster; |
| 896 | else |
| 897 | return 0; |
| 898 | } |
| 899 | |
| 900 | |
| 901 | /* |
| 902 | * Get the amount of free space on the diskette |
| 903 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 904 | mt_off_t getfree(Stream_t *Dir) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 905 | { |
| 906 | Stream_t *Stream = GetFs(Dir); |
| 907 | DeclareThis(Fs_t); |
| 908 | |
| 909 | if(This->freeSpace == MAX32 || This->freeSpace == 0) { |
| 910 | register unsigned int i; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 911 | uint32_t total; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 912 | |
| 913 | total = 0L; |
| 914 | for (i = 2; i < This->num_clus + 2; i++) { |
| 915 | unsigned int r = fatDecode(This,i); |
| 916 | if(r == 1) { |
| 917 | return -1; |
| 918 | } |
| 919 | if (!r) |
| 920 | total++; |
| 921 | } |
| 922 | This->freeSpace = total; |
| 923 | } |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 924 | return sectorsToBytes(This, |
| 925 | This->freeSpace * This->cluster_size); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 926 | } |
| 927 | |
| 928 | |
| 929 | /* |
| 930 | * Ensure that there is a minimum of total sectors free |
| 931 | */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 932 | int getfreeMinClusters(Stream_t *Dir, uint32_t size) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 933 | { |
| 934 | Stream_t *Stream = GetFs(Dir); |
| 935 | DeclareThis(Fs_t); |
| 936 | register unsigned int i, last; |
| 937 | size_t total; |
| 938 | |
| 939 | if(batchmode && This->freeSpace == MAX32) |
| 940 | getfree(Stream); |
| 941 | |
| 942 | if(This->freeSpace != MAX32) { |
| 943 | if(This->freeSpace >= size) |
| 944 | return 1; |
| 945 | else { |
| 946 | fprintf(stderr, "Disk full\n"); |
| 947 | got_signal = 1; |
| 948 | return 0; |
| 949 | } |
| 950 | } |
| 951 | |
| 952 | total = 0L; |
| 953 | |
| 954 | /* we start at the same place where we'll start later to actually |
| 955 | * allocate the sectors. That way, the same sectors of the FAT, which |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 956 | * are already loaded during getfreeMin will be able to be reused |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 957 | * during get_next_free_cluster */ |
| 958 | last = This->last; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 959 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 960 | if ( last < 2 || last >= This->num_clus + 2) |
| 961 | last = 1; |
| 962 | for (i=last+1; i< This->num_clus+2; i++){ |
| 963 | unsigned int r = fatDecode(This, i); |
| 964 | if(r == 1) { |
| 965 | goto exit_0; |
| 966 | } |
| 967 | if (!r) |
| 968 | total++; |
| 969 | if(total >= size) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 970 | return 1; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 971 | } |
| 972 | for(i=2; i < last+1; i++){ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 973 | unsigned int r = fatDecode(This, i); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 974 | if(r == 1) { |
| 975 | goto exit_0; |
| 976 | } |
| 977 | if (!r) |
| 978 | total++; |
| 979 | if(total >= size) |
| 980 | return 1; |
| 981 | } |
| 982 | fprintf(stderr, "Disk full\n"); |
| 983 | got_signal = 1; |
| 984 | return 0; |
| 985 | exit_0: |
| 986 | fprintf(stderr, "FAT error\n"); |
| 987 | return 0; |
| 988 | } |
| 989 | |
| 990 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 991 | int getfreeMinBytes(Stream_t *Dir, mt_off_t size) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 992 | { |
| 993 | Stream_t *Stream = GetFs(Dir); |
| 994 | DeclareThis(Fs_t); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 995 | mt_off_t size2; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 996 | |
| 997 | size2 = size / (This->sector_size * This->cluster_size); |
| 998 | if(size % (This->sector_size * This->cluster_size)) |
| 999 | size2++; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1000 | if((smt_off_t)size2 > UINT32_MAX) { |
| 1001 | fprintf(stderr, "Requested size too big\n"); |
| 1002 | exit(1); |
| 1003 | } |
| 1004 | return getfreeMinClusters(Dir, (uint32_t) size2); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1005 | } |
| 1006 | |
| 1007 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1008 | uint32_t getStart(Stream_t *Dir, struct directory *dir) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1009 | { |
| 1010 | Stream_t *Stream = GetFs(Dir); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1011 | uint32_t first; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1012 | |
| 1013 | first = START(dir); |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1014 | if(fat32RootCluster(Stream)) { |
| 1015 | first |= (uint32_t) STARTHI(dir) << 16; |
| 1016 | } |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1017 | return first; |
| 1018 | } |
| 1019 | |
| 1020 | int fs_free(Stream_t *Stream) |
| 1021 | { |
| 1022 | DeclareThis(Fs_t); |
| 1023 | |
| 1024 | if(This->FatMap) { |
| 1025 | int i, nr_entries; |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1026 | nr_entries = (This->fat_len + SECT_PER_ENTRY - 1) / |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1027 | SECT_PER_ENTRY; |
| 1028 | for(i=0; i< nr_entries; i++) |
| 1029 | if(This->FatMap[i].data) |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 1030 | free(This->FatMap[i].data); |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1031 | free(This->FatMap); |
| 1032 | } |
| 1033 | if(This->cp) |
| 1034 | cp_close(This->cp); |
| 1035 | return 0; |
| 1036 | } |